Airline veteran and cofounder of IndiGo makes debut on list on upcoming IPO of the carrier in which he owns a 45% stake with family. An engineer from the Indian Institute of Technology with an M.B.A. from Wharton, he began his aviation career with United Airlines and went on to head United Airways. Teamed up with pal Rahul Bhatia (No. 38) a decade ago to start IndiGo.